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Please see the bug report I filed on rt.cpan.org for this functionality. The circular ref detection can be fooled by a combination of strong and weak references to the same thing. If it sees the weak reference first, it will not detect any other strong references.

If you have some code with a lot circular refs and are trying to get rid of them all through the use of weak refs, this can be a problem since you might miss some strong refs but still think you're done.